Abstract
This study aimed to evaluate the influence of sodium monensin on the hepatic accumulation of copper in sheep. Twenty-four Santa Inês crossbred sheep were used and allocated in a 2 × 2 factorial experiment with six repetitions and considering the factors dietary copper (basal and high) and supplementation (with and without sodium monensin). Thus, four homogeneous groups were formed: control (basal diet); monensin (Mon), 30 ppm of monensin; copper (Cu), 10 10 mg/kg BW per day of copper; monensin + copper (MonCu). The experimental period lasted 14 weeks. Liver and bile samples were collected at the beginning and end of the experiment to determine mineral element concentrations, and weekly blood samples for biochemical, hematological, and mineral evaluation. Liver copper concentrations at the beginning of the experiment did not vary between groups, while mean liver copper concentrations at the end of the experiment were higher in the MonCu, Cu, and Mon groups when compared to the control. At the end of the study, hepatic copper concentration was influenced by copper (p = 0.0001) and monensin (p = 0.0003) supplementation. Copper-supplemented groups had reduced liver iron contents (p = 0.0287) and increased copper concentrations in bile. The biochemical evaluation showed increased serum GGT and AST activity (p < 0.05) in the Cu and MonCu groups from the eleventh week on compared to the control and Mon groups. The increase in activity of these enzymes was influenced by copper supplementation (p = 0.0340). Monensin interferes positively with the hepatic accumulation of copper and the supplementation of this additive may predispose sheep to copper poisoning.
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AHHM is grateful to CNPq for his research productivity fellowship.
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This research was funded by The São Paulo Research Foundation—FAPESP.
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All procedures and animal handling followed the ethical principles in animal experimentation, adopted by the present study which was approved by the Ethics Committee on Animal Research of the School of Veterinary Medicine and Animal Science, University of São Paulo.
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Rodrigues, F.A.M.L., Sousa, R.d., Minervino, A.H.H. et al. Effects of Sodium Monensin on Copper Metabolism of Brazilian Santa Inês Sheep Submitted to Different Dietary Copper. Biol Trace Elem Res 201, 196–203 (2023). https://doi.org/10.1007/s12011-022-03132-7
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DOI: https://doi.org/10.1007/s12011-022-03132-7